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The robber tapped on the drive-through window at about 3:30 a.m. Friday, forced it open, fired a shot that did not hit anyone, then crawled inside and forced workers to open a safe, police said.

One employee ran outside and got a Kennywood Park public safety officer to help, and a Duquesne police officer found the woman near a Dumpster. West Mifflin officers also responded.

Police said nearly $3,600 in cash and some coupons for free sandwiches were taken. All of it was recovered.

The suspect -- identified by police as 32-year-old Amanda Shaffer -- is no stranger to the restaurant on Hoffman Boulevard. Police and neighbors say she used to work there.

Employees were very upset by the incident. One of them -- Shaffer's mother, the on-shift manager -- dropped to the ground, crying and yelling, "Angel, why would you do this?" Police helped the mother to her feet and escorted her away.

Video showed Shaffer yelling at a Channel 4 Action News camera and kicking the door of a police car after being taken into custody.

A manager on duty Friday morning answered "No sir" when Channel 4 Action News reporter Bob Hazen asked him if he could say if Shaffer was an employee or not.

Police said Shaffer told them that she committed the robbery for her children. The kids, ages 10 and 8, were left at her North Fourth Street home and are now with an aunt, police said.